Exchange 2010/2013 - Issue of Test-OutlookWebServices failed

When you try to run the Test-OutlookWebServices script on a newly installed Exchange 2010 Server, the following error may occur in the Exchange Management Shell (EMS)

The Microsoft Exchange Server 2010 Management Pack for System Center Operations Manager runs Exchange Management Shell cmdlets to monitor your Exchange organization. Running cmdlets triggers one or more Operations Manager alerts if a problem is detected.

Use the Test-OutlookConnectivity cmdlet to test end-to-end Microsoft Outlook client connectivity in the Microsoft Exchange Server 2013 organization. This includes testing for both Outlook Anywhere (RPC/HTTP) and MAPI/HTTP connections.

When you try to run the Test-OutlookWebServices script on a newly installed Exchange 2010 Server, the following error may occur in the Exchange Management Shell (EMS) 

[PS] C:\Windows\system32>Test-OutlookWebServices

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If this is the first time you try to run the test, this typically means you haven’t configured the test account yet. You should run the new-TestCasConnectivityUser.ps1 script first. Follow these instructions to make it work:

1. Open a Exchange Management Shell on the Exchange Server
2. In my case Navigate to D:\Program Files\Microsoft Exchange Server\ (or any other folder where you installed Exchange
3. Navigate to the folder Scripts
4. Run .\new-TestCasConnectivityUser.ps1
5. When asked, type a strong password (Exchange 2010 will change this password automatically at a later time)

Normally it should be fixed but if not you will get another error: 

CreateTestUser : Mailbox could not be created. Verify that OU ( Users ) exists and that password meets complexity requirements.
                      At C:\Program Files\Microsoft\Exchange Server\V14\Scripts\new-TestCasConnectivityUser.ps1:255 char:27
                      +   $result = CreateTestUser <<<<  $exchangeServer $mailboxServer $securePassword $OrganizationalUnit $UMDialPlan $UMExtension $Prompt
                      + CategoryInfo          : NotSpecified: (:) [Write-Error], WriteErrorException
                      + FullyQualifiedErrorId : Microsoft.PowerShell.Commands.WriteErrorException,CreateTestUser

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To Resolve this issue, I opened the script in notepad and found the line beginning "new-mailbox" – and deleted the parameter "–OrgainisationalUnit:$OrganistationalUnit". This means the new user defaults to the default OU – Users!

Run the script again and it should be successful.